Hot-air heater



July 6 1926. 1,591,889

G. P. SCHMITT HOT AIR HEATER Filed March 17, 1924 3 Sheets-Sheet 1 QQQLQQ; gmljmmmmmmmmmme mmmggg m m ';;|Zi|iDljUljljD[]E;|1

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G. P. SCHMITT HOT AIR HEATER Filed March- 7 19 24 3 Sheets-Sheet 2 I ATTORNEY July 6,1926. 1,591,889

G P. SCHMITT HOT AIR HEATER Filed March 17, 1924 3 Sheets-Sheet 5 9 'INVENTOR 660/92 7. Sch/2707 ATTORNEY 'Fatented duly 6,, i126.

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GEORGE E. SCHMITT, F OAAND, CALIFORNIA. I

HGT-AIR HEATER.

Application filed. March 17, 1924. Serial No. 699,753.

This invention relates to hot air heaters and in articular to heaters adapted to the use p gaseous fuel.

The outstanding feature of this invention is the provision of a heater constructed in such a manner that the products of combustion from the burner are delivered to the flue without coming in contact with the fresh air circulated within the heater enclosure,

thereby eliminating any. obnoxious odors or p isonous fumes which necessarily emanate rom this form of combustion.

Another feature of this invention is the novel arrangement of the outlet flue with re- 11 lation to the burner, which flue extends downwardly from the top of the heater unit to a point virtually at the burner level which provides a maximum radiation surface and (GliVOlS the products of combustion to the outside at a minimum temperature.

I have shown my heater as applied to the fioor of a room with the heater casing and burner below the level thereof and a register covering the opening above the heater and having the main burner control valve and pilot control constructed to extendto the top level of the register, but it is to be understood that the heater may be placed upon a suitable support in the basement and used as a furnace with minor changes in the details of arrangement without departing from the main features of the heater construction.

The object of this invention is to construct a heater which is compact, inexpensive in operation and easily controlled.

Another object is to construct a heater which will deliver a maximum degree of fresh hot air with a minimum consumption of fuel.

Other objects and advantages of my invention will appear with reference to the subjoined speci cation and accompanying three sheets of drawings, in which:

Figure 1 is a plan of my heater in place below the floor of a room and showing the register and arrangement of control valves, main burner, pilot arrangement and sight opening to the main burner.

Fig. '2 is a cross section taken at line 2-2 of Fig. 3 and showing the relative arrange ment of the outer and inner casings and location of the heater with relation to both casings.

Fig. 3 is a vertical mid-section taken at the lines 33 of Figs. 1 and 2 and showing the entire arrangement of the heater, fuel connections and air circulation.

Fig. 4 is a vertical section of the heater unit taken at right angles to Figs. 2 and 3 and at the line 4-4 of Fig. 2, the outer and to inner casings being omitted.

Fig. 5 is a plan of the burner.

Referring to Figs. 1, 2 and 3 of the drawings it will be seen that I have shown my heater as applied to the floor of a room as and I will therefore describe it accordingly. The outer casing (10) is of rectangular shape and preferably constructed of heavy galvanized material and fits within an opening (11) in the floor and to the edge of which itlis attached in any suitable manner. The lower edges'of this casing are flanged inwardly and support a-base plate (12) having a central opening (13) in which the combustion chamber casting (14) or housing is W centrally located.

A grilled register (15) fits-within the upper end of the outer casing, (10) and rests upon the floor, and an inner casing 516) of rectangular shape is attached to the ugs tit) (17 formed at the under side of the register. This casing flares outwardly from its top edge and ends a distance above the housing (14). An air circulation passage (18) is thus formed between the outer casing (10) at and inner casing (16) and extends downwardly from the outer rows (19) of the openings in the register (15) to the base plate, and the space within the inner casing (16) communicates with the central opento ings (20) of said register.

The heater element comp-rises duplicate castings or housings (14) and (21) which are of comparativel thin metal and sub-- stantially T-shaped in cross section. These as castings are of hollow construction and provided with elongated extensions (22) of rectangular shape and communicating chambers (23). Said extensions (22) and chambers (23) open outwardly at opposite sides 1100 of the housings, and the extension (22) of the housing (14) fits' within the opening (13) in the base plate and rests upon lugs formed upon said housing.

Flanged cover plates (25) and (26) fit within the upper edges of the housin s (14) i and (21) and are rovided with a p urality. of equally spaced anged openings (27) and ating columns (29).

preferably constructed of galvanized sheet- (28) to which are fitted a plurality of radi- These columns are metal pipe and provide means for spacing the housings (14) and (21) and serve to radiate the heat passing therethrough from the burner.

In the drawings I have shown four of these radiating columns, but in larger furnaces it will be necessary to provide many columns, the number depending upon the inside area of the furnace and radiating surface required.

An outlet housing (30) fits over and embraces the upper housing (21) and consists of a rectangular shell having a flanged extension (31) fitting around the upper edge of the extension (22) of said housing, and rests upon a baflie plate (32) extending from one end thereof to near the other- A neck or thimble is integrally formed with the outlet housing (30) and extends downwardly at one end thereof and at right angles to the chamber (34) of the housing and communicates therewith through an opening (35). An opening (36) is formed at one end of the bafiie plate I (32) and communicates with the chamber in the housing (21) and the chamber (34) of the outlet housing (30).

A pipe (37) extends downwardly from L the neck (33) and through an opening in .ply extends into the outer casing the plate (12) and is connected to a flue (not shown). A burner (38) is positioned within the opening of the extension (22) of the housing (14) and is held therein by a strap (39) secured at opposite ends to the base plate (12). This burner is of an ordinary type and is provided with a gas inlet pipe (40) and burner tip as shown in Fig. 3. A feed pipe (41) from the as sup- 10) below the floor and is provided with branch pipes having control valves (42) and (43) for the main burner inlet (40) and pilot valve (44). The/upper ends of the valve stems (45) of the control valves and (43) are squared and extend into openings in the register and a key is used to manipulate said valves to control the flow of gas I from the pipe (.41).

The pilot burner (44) is located at the rear end of the burner (38) and is provided with a slotted opening which projects a fanshaped flame into the combustion chamber above the main burner as shown in Fi 3. A pipe (46) leads from the register %l5) and extends through the base plate (12) and is held thereby. This pipe extends to a position above the top of the pilot burner (44) and said pilot may be ignited by turning the valve (43) and holding a match over the upper end ofv this pipe. This method of igniting the pilot each time to light the main burner saves considerable gas and obviates extinguished.

A U-shaped rod (47) embraces the entire heater unit and the ends thereof extend through openings in the base plate (12) and through the ends of the burner strap (39) and are securely held in place and drawn against the plate (12) by nuts (48).

The contacting edges of the cover plates (25) and (26)and housings (14) and (21) may be sealed by means of any well known cement suitable for this purpose.

A sight opening (49) is provided in the upper housing (21) to enable the operator to properly adjust the burner from the room above by manipulation of the burner valve (42).

In operation, hot air from the burner travels upwardly from the chamber in the housing (14) to the radiating columns (29) and is equally distributed therethrough to the upper housing (21) and against the baffie plate (32), which plate deflects it to the opening (36), thence through the chamber (34) of the outlet housing (30) to the neck (33) and pipe (37) to the fiue. It will thus be seen that all poisonous products of combustion are drawn from the burner and dclivered directly to the flue, and that the heat radiating surfaces of the housings and columns tend to draw and continuously circulate fresh air from the room through the passage (18) and upwardly within the inner casing (16) to the register openings (20).

Having thus illustrated and described my invention in its preferred form, I wish it understood that the same may be modified as practice suggests. Therefore, the patent protection that I desire to secure is all of that which comes within the scope and spirit of my invention as set forth in the following claim.

Claim:

In a heater adapted to have a fine connected therewith, the combination of an outercasing and an inner casing, said inner casing being open at the bottom, a register covering both casings, a cold air passage between the outer casing and inner casing, a heater unit within the inner casing, a burner therefor, a hot air passage between said heater unit and inner casing leadin to the register and an outlet passage lea ing through the inner casing and the outer casing from the top of the heater unit to a position virtually at the burner level below IOU the outer casing and thence to the flue and GEORGE P. SCHMITT. 

